138824449 has 4 divisors (see below), whose sum is σ = 138933936. Its totient is φ = 138714964.

The previous prime is 138824447. The next prime is 138824453. The reversal of 138824449 is 944428831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138824449 - 2¹ = 138824447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138824447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52819 + ... + 55384.

It is an arithmetic number, because the mean of its divisors is an integer number (34733484).

Almost surely, 2^138824449 is an apocalyptic number.

It is an amenable number.

138824449 is a deficient number, since it is larger than the sum of its proper divisors (109487).

138824449 is a wasteful number, since it uses less digits than its factorization.

138824449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109486.

The product of its digits is 221184, while the sum is 43.

The square root of 138824449 is about 11782.3787496413. The cubic root of 138824449 is about 517.7919800488.

The spelling of 138824449 in words is "one hundred thirty-eight million, eight hundred twenty-four thousand, four hundred forty-nine".